19705018 has 4 divisors (see below), whose sum is σ = 29557530. Its totient is φ = 9852508.

The previous prime is 19705009. The next prime is 19705061. The reversal of 19705018 is 81050791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81050791 = 7321 ⋅11071.

It can be written as a sum of positive squares in only one way, i.e., 11881809 + 7823209 = 3447^2 + 2797^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4926253 + ... + 4926256.

Almost surely, 2^19705018 is an apocalyptic number.

19705018 is a deficient number, since it is larger than the sum of its proper divisors (9852512).

19705018 is an equidigital number, since it uses as much as digits as its factorization.

19705018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9852511.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 19705018 is about 4439.0334533545. The cubic root of 19705018 is about 270.1006392094.

The spelling of 19705018 in words is "nineteen million, seven hundred five thousand, eighteen".